Home / 38,985.86-53,800.20-21,990.23

Finding the Fourth Proportional to 38,985.86, 53,800.20 and 21,990.23

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Solution

The fourth proportional to 38,985.86, 53,800.20 and 21,990.23 is: 30,346.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,985.86 : 53,800.20 = 21,990.23 : x
  2. Step 2: Convert to fraction form
    38,985.86/53,800.20 = 21,990.23/x
  3. Step 3: Cross multiply
    38,985.86x = 53,800.20 × 21,990.23
  4. Step 4: Simplify right side
    38,985.86x = 1,183,079,007.42
  5. Step 5: Solve for x
    x = 1,183,079,007.42/38,985.86
  6. Step 6: Final answer
    x = 30,346.36

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.